Table 1. Distribution of selected characteristics among patients with esophageal squamous cell carcinoma and controls.
| Variable | Huaian set |
Jinan set |
||||
|---|---|---|---|---|---|---|
| Cases | Controls | P-value1 | Cases | Controls | P-value1 | |
| No. (%) | No. (%) | No. (%) | No. (%) | |||
| 588 | 600 | 1000 | 1000 | |||
| Sex | 0.678 | 0.426 | ||||
| Male | 413(70.2) | 428(71.3) | 776(77.6) | 761(76.1) | ||
| Female | 175(29.8) | 172(28.7) | 224(22.4) | 239(23.9) | ||
| Age (year)2 | 0.725 | 0.474 | ||||
| ≤59(or 56) | 288(49.0) | 300(50.0) | 516(51.6) | 500(50.0) | ||
| >59(or 56) | 300(51.0) | 300(50.0) | 484(48.4) | 500(50.0) | ||
| Smoking status | <0.001 | <0.001 | ||||
| No | 151(25.7) | 397(66.2) | 248(24.8) | 604(60.4) | ||
| Yes | 437(74.3) | 203(33.8) | 752(75.2) | 396(39.6) | ||
| Drinking status | <0.001 | <0.001 | ||||
| No | 254(43.2) | 358 (59.7) | 447(44.7) | 599(59.9) | ||
| Yes | 334(56.8) | 242(40.3) | 553(55.3) | 401(40.1) | ||
1Two-sided χ2 test.
2Median ages of patients for Huaian set and Jinan set are 59 and 56 years.